Safety-valve



(No Model.)

A. C. .MEADY.

SAFETY VALVE.

No. 374,617. P'atentd Dec. 13, 1887,;

g x V Q N. PETER}. Pholo-Llllwgnpluy. Washinglon. 0.1;

UNITED STATES PATENT OFFICE;

ALBERT O. MEADY, OF SOMERVILLE, ASSIGNOR TO THE CROSBY STEAM- GAGE AND VALVE COMPANY, OF BOSTON, MASSACHUSETTS.

S AF ETY-VALVE.

SPECIFICATION forming part of Letters Patent No. 374,617, dated December 13. 1887- a Application filed July 25, 1887.

To all whom it 11mg concern:

- Be it known that I, ALBERT CECIL ll/IEADY,

of Somerville, in the county of Middlesex and Commonwealth of Massachusetts, have invented a new and useful Improvement in Safety-Valves for Steam-Boilers; and I do hereby declare the same to be described in the following specification, and represented in the accompanying drawings, of which Figure 1 is a vertical section, and Fig. 2 a horizontal section, of a safety-valve provided with myinvention, said section being taken on line 1 1 of Fig. 1. Fig. 3 is a top view, and Fig. at a vertical section, of the annular gate hereinafter described. v

My invention consists in applying to the outer periphery of the body of the valve-seat an annular gate provided with lugs on its interior periphery, said lugs being to operate with the mouths of the radial passages leading from a central chamber or well,which receives the stem of the valve and guides it in its vertical movements.

In the drawings, A denotes a safety-valve,

which rests upon two concentric annular seats, a 1), arranged in the same horizontal plane in the top of a tubular base or body, B, said base having in its bore a cylindrical well, 0, closed at its bottom and supported by a series of radial and tubular arms, (1, which connect said base and well. The passages 0 in the said radial arms open from the outer periphery of the base into the bore of the well a, and said bore receives a stem, 6, fluted or grooved vertically and extending from the valve A. The narrow portions of the periphery of the stem between the said flutes or grooves bear against the interior surfaces of the bore of the well and serve to guide the valve in its vertical movements. The valve A is held down. against the pressure of the steam by a spiral spring, 0, the tension of which can be varied by a threaded bolt, D, arranged as shown.

In carrying out my invention I apply to the outer cylindrical surface of the body B an an- 4 5 nular gate, G, which rests upon a shoulder, h,

as shown, and is provided with lugsf, which, when the gate is turned horizontally, operate to close more or less, as may be desired, the mouths of the passages 0,leading from the bore of the well,to regulate the pressure of the steam against the valve under its inner seat. The gate isprovided with a set-screw, g, to confine it to the body when adjusted to the required position.

I claim 1. The combination of the valve A and its fluted stem 6, the body B, provided with theannular seats a b, cylindrical well 0, and tubular arms d,connecting said well and body with the annular gate G, applied to said body, as shown, and provided with a set-screw, and having lugsf to close more or less, as may be required, the mouths of the passages 0, leading from the bore of the cylindrical well, said valve being held down on its seat by a spiral'spring, the tension of which is regulated by a threaded bolt arranged in the top of the valve-case, all substantially as shown and described.

2. The gate G, provided with the lugs and set-screw, as shown, in combination with the body B, having the radial passages and cylindrical well and annular valve-seats, said gate being applied to the body and to operate with the radial passages, substantially as shown and described.

ALBERT O. MEADY. Witnesses:

S. N. PIPER, WILBUR A. DODGE.

Correction in Letters Patent No; 374,617. I

It is hereby certified that in Letters Patent No. 374,617, granted December 13, 1887, upon the application of Albert G. Meady, of Somerville, Massachusetts, for an improvement in Safety-Valves, an error appears in the printed. specification requiring correction, as follows: In line 60, a comma should be inserted after the word body,

and. that the Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed, conntersigned, and sealed this 27th day of December, A. D. 1887.

H. L. MULDROW, Acting Secretary of the Interior.

[snub] Oountersigned:

BENTON J. HALL,

Commissioner of Patents. r 

